24 C.F.R. § 200.161
The Secretary of the Treasury or the Acting Secretary of the Treasury is authorized and empowered, on behalf of the Commissioner, to administer the regulations governing any transactions and operations in debentures, to do all things necessary to conduct such transactions and operations, and to delegate such authority at his discretion to other officers, employees, and agents of the U.S. Treasury Department. At his discretion the Secretary, the Under Secretary, or any Assistant Secretary of the Treasury acting by direction of the Secretary, is authorized to waive any such regulation on behalf of the Commissioner in any particular case where a similar regulation of the Treasury Department with respect to United States bonds or interest thereon would be waived.
24 C.F.R. §200.161